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drm/amd/display: Fix Vega10 black screen after mode change

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[Why]
The sequence is slightly changed when bring .set_bandwidth out
from the end of programming backend to the end of programming
surface. Vega10 doesn't like to get clocks updated if
stream_count is zero in the current context (Atomic Reset).

[How]
Do not update clocks if no stream is showing up in the context.

Fixes 1b2b130192 "dc: Remove 300Mhz minimum disp clk limit."

Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jerry (Fangzhi) Zuo 2018-07-17 11:53:54 -04:00 committed by Alex Deucher
parent 65c78961b3
commit f358b39d18
3 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
View File

@ -2552,7 +2552,7 @@ static void pplib_apply_display_requirements(
dc->prev_display_config = *pp_display_cfg;
}
static void dce110_set_bandwidth(
void dce110_set_bandwidth(
struct dc *dc,
struct dc_state *context,
bool decrease_allowed)

5
drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.h
View File

@ -68,6 +68,11 @@ void dce110_fill_display_configs(
const struct dc_state *context,
struct dm_pp_display_configuration *pp_display_cfg);
void dce110_set_bandwidth(
struct dc *dc,
struct dc_state *context,
bool decrease_allowed);
uint32_t dce110_get_min_vblank_time_us(const struct dc_state *context);
void dp_receiver_power_ctrl(struct dc_link *link, bool on);

10
drivers/gpu/drm/amd/display/dc/dce120/dce120_hw_sequencer.c
View File

@ -244,7 +244,16 @@ static void dce120_update_dchub(
dh_data->dchub_info_valid = false;
}
static void dce120_set_bandwidth(
struct dc *dc,
struct dc_state *context,
bool decrease_allowed)
{
if (context->stream_count <= 0)
return;
dce110_set_bandwidth(dc, context, decrease_allowed);
}
void dce120_hw_sequencer_construct(struct dc *dc)
{
@ -254,5 +263,6 @@ void dce120_hw_sequencer_construct(struct dc *dc)
dce110_hw_sequencer_construct(dc);
dc->hwss.enable_display_power_gating = dce120_enable_display_power_gating;
dc->hwss.update_dchub = dce120_update_dchub;
dc->hwss.set_bandwidth = dce120_set_bandwidth;
}